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Certain types of modern displays use less power when displaying a black or dark background, including the technology used in the Apple Watch. It’s all thanks to the wonders of OLED and self-emissive display technology.

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Source: https://www.howtogeek.com/706181/does-a-dark-watch-face-save-battery-power-on-apple-watch/
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The Article Was Written/Published By: Tim Brookes